Tools for debugging DNS fuckup-ery

If you have a hang-over, and you are trying to show someone who is not a command-line freak, why their web-site is down for DNS reasons, you can do worse than this on-line graphical tool;
http://www.zonecut.net/dns/

Looks to have been setup by Bjorn Isaksson some time in the ancient past internet terms, i.e. before last Tuesday.